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[Intro Music]

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Alright, we have just created the

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very first small application, and

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run it using Node.js container. And

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it was relatively easy. All what we

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did, we actually executed a

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specific file, namely hello.js

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using Node interpreter. That's it.

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Now let's create a bit more

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complicated application with

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additional NPM package that we will

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need to install into our

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application locally on our

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computer. And for that, we will use

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command from Docker container.

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Let's do that. Let's clear

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terminal, and let's move to our

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Visual Studio Code project first,

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and here let me close hello.js

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file, and let's create a new folder

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inside of the 'node' folder. For

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that, select 'node' folder; and click

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on this folder icon and create a

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new folder named 'express', like so.

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And here inside of this folder,

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let's create a new file index.js,

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like so index.js. And now let's

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open up web browser and type here

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'npmjs.com'. NPM in Node.js stands

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for Node Package Manager. And using

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NPM, you're able to install many,

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many different public open source

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packages and create applications,

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your applications based on those

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third party packages. Let's search

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here for package called 'express'. It

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is very, very popular package.

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Let's click on this first link,

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'express'. And you'll see that this

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package is downloaded more than 11

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million times every week. Let's

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here scroll down, and you'll see

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how to create a very simple express

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web server. And let's use those

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commands. Let's simply copy all of

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them from this page, copy and go to

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our index.js file here in 'express'

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folder, and paste all files like so.

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And let's adjust this application a

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bit. Let's type here, not 'Hello

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World', let's type, 'This Express app

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was executed by Node.js container

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inside of the Docker', like so. Let's

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press again key combination 'Alt',

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Option 'Z', to remove horizontal

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scrolling. And let's save the file.

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And notice that our application

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will now listen at Port 3000. And

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that means that we will need to use

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port mapping if we want to connect

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to our express web server from

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outside. And we will do that, of

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course in this lecture. Great.

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Let's now try to execute this file

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using the same approach as we used

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in the previous lecture. Let's go

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to the terminal, and here let's 'cd'

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to 'express' folder, because now we

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are located in 'node' folder, we need

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to move to 'express' folder, 'cd' to

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'express'. Let's list files here. And

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yes, I see single index.js file

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here. And let's now use same

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command as we used before, let me

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go to this command in history, and

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let's adjust it, and instead of

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hello.js, let's type index.js, and

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let's try to run this application

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using the same command as we used

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for hello-world application. Let's

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press Enter. And I see error, Cannot

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find module 'express'. And the reason

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for that is very simple. We need to

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first download this express module

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from NPM; and only afterwards, run

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our application. Otherwise, you will

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get such errors 'module not found'.

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And again, if I'll go back to this

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application in the Visual Studio

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Code, you'll see that we actually

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'require' external module 'express'

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Here's this line responsible for

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that. And that's why first we need

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to run 'npm install' command for our

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application. And if I'll try to do

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it locally on my computer using

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simply 'npm install' command, I'll

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get 'command not found: npm', because

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there is no Node.js or NPM installed

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on my local computer. And that's

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why we need to somehow run 'npm

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install' command using Node.js

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Docker container. Question, how are

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we able to do so? We are able to do

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so using same approach as we used

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in the previous command. In the

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previous command we have overridden

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default command and here was custom

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command that was executed after the

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start of this container. And now we

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want to run 'npm install' command.

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And for that we need to simply replace this

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command, 'node index.js' with 'npm

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install' command. But please note

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that all those two options will

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need to remain in place because we

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need to run 'npm install', let's say

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in our local folder on our

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computer. Let's try that. Let me

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remove 'node index.js', and type here

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'npm install', and let's press ENTER.

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[no audio]

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Now, I see some meaningful output

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after entering this command, and it

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seems that node container tried to

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install packages, but we see

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warning, 'no such file or directory',

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not able to open file 'package.json'

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inside of the 'app' folder,

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inside of the container. And that

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actually means that we need to

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first initialize our Node.js

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project using 'npm init' command, and

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answer some prompts. And

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afterwards, node container will

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create package.json file. Let's do

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that. Let me clear terminal and

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here let's go to this command. And

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instead of 'npm install', let's type

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'npm init', like so. And now we see

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actually this prompt, 'This utility

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will walk you through creation of the

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package.json file', and

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afterwards, we see prompt to name

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our application or package, and

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here is the default name 'app', but

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afterwards, this script actually

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terminated. And the reason for that

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is that we have not connected to 'stdin'

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of this process. And you may

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guess that we need to add '-it'

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options in order to be able to

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proceed with this interactive

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conversation with Node.js container.

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Let me clear terminal and move

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to this command back. And here,

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let's add '-it' options, and make

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sure that you add those options

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somewhere before name of the 'node'

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image. Let's press Enter. And now I

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am able to proceed with those

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prompts. I am happy with this

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default application name version is

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1.0.0. Let's press ENTER.

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'description' is empty. Again, I'll

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use the default values everywhere.

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'entry point: index.js', 'test

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command', 'git repository', 'keywords',

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'author', 'license: ISC'. And if I'm

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happy with all those settings, I

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could press Enter and file package.json

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file should now be created

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in our local folder. Let's verify

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that, 'ls'. And yes, I see actually

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two files 'package.json', and

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'package-lock.json'. I will not explain

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in details what this 'package-lock.json'

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file means; but if I'll go to

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Visual Studio Code; and go to our

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express application, you'll see

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those files here as well. And if

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I'll have a look at package.json

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file, you will see this set of

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actually values assigned to some

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keys like name, version,

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description, and so on. Great, now

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we are ready to try again

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installation of packages using 'npm

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install' command. But important

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outcome from this command is that

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Node.js container has actually

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created files package.json file,

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and this one inside of our local

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folder on our computer. And now

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those files actually belong to our

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application,and you're able to run

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this application using any other

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Node.js container. Alright, let's

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now go to terminal, and let's run

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'npm install' command. But actually,

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we need to run 'npm install' command

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along with the name of the package

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we want to install into our

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project. And name of the package is

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'express', here it is. Let's go to

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terminal, and here let's clear it

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quickly, and let's run command 'npm

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install express', like so. Here is

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entire command that will be

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executed after the start of this

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container. And please notice that

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each time when we run such command,

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we actually start brand new

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container. Let's press Enter. And

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now you see that some job is

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undergoing right now. And you see

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now that 'express' package was

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installed into our project. And now

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if I go to Visual Studio Code, you

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should see here, let's refresh, you

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should see here 'node_modules' folder

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inside of the 'express' folder. And

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inside of that folder, you'll see a

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bunch of other folders that

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contain actually additional

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packages that were installed along

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with 'express' package. That's

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because 'express' package itself has

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a bunch of its own dependencies.

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And here you see that in total 50

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packages from 37 contributors were

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added. Great. That's how we were able

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to finally install 'express' package

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into our Node.js application. And

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notice that for that we have used

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Node.js container, and we have

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executed some 'npm' commands inside

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of that container. It is very, very

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important. We have not used node or

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npm locally on our computer,

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because it's simply absent in the

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moment. Great.

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Let's now try to start our

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application once again using 'node

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index.js' command. Let's clear

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terminal, and go back to this

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command, and instead of 'npm install

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express', let's type 'node index.js'.

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Here was our index.js file. Here it

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is, and we want to execute it using

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node. Let's press Enter. And we see

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that we have connected actually

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took Node.js process inside of the

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container, and container now is up

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and running. Let's open up new tab,

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and here let's verify that, 'docker

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ps', and you'll see that this

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container is up. And now we are

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actually able to verify whether we

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are able to connect to our 'express'

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server or not. And you may guess that

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we will not be able to connect to this

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port. And I'm sure that you know

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the answer. We have not actually

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mapped external port to this

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internal port 3000. But let's

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anyway, try to open up a web

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browser, and here let's type

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localhost:3000, like so. And

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of course, I see this error, 'This site

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can't be reached'. Let's now modify our

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command here, and let's add also

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port mapping. Let's go to this step,

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Let's terminate our application.

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And you see that actually this

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doesn't work with this process,

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because we are connected directly

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to a Node.js process that at the

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moment doesn't actually handle 'SIGINT'

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signal. Let's go to this step,

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and let's stop this container

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manually using 'docker stop' command.

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And let's type here 'a7', for

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example. Actually, we need to use a

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'docker kill' better because we will

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need to wait 10 seconds because

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again, SIGTERM signal is also not

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recognized by Node.js process. And

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finally, in 10 seconds, this

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container will stop. And if I go

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back here, you'll see that this

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process is over. Let's now add all

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support mapping; and here for that,

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let's use option '-p'; and

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let's say that we want to simply

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run this 'Node.js express'

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application using same port as was

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opened by express application

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itself, it is 3000. Let's go here

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and type 3000 as external port.

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And after colon, let's type 3000 as

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internal port as well. Let's now

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press Enter, and see whether we will

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be able to connect to our Express

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web server now. Let's go to Google

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Chrome. And here let's refresh

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page. And now I see message, 'This

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Express app was executed by Node.js

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container inside of the Docker'; and

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that means that now our port

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mapping works, and now our tiny

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Express application works as well.

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And again, for that we are required

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to enter some NPM commands in order

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to install express package inside

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of our Express application. And

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if I'll go to package.json file,

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you will see additional dependency

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that was added here in this file

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and this 'express' package. Great.

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Now let me demonstrate you how

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we're able to handle Ctrl+C inside

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of the Node.js application, and

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let's adjust our application a bit

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but let's do it after the small pause See you next. Bye-Bye.

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[no audio]